February 8, 2009 6:00 AM

Global warming studies often depend on average citizens

As scientists track global warming, they're using sometimes centuries-old data to assess its impact on plants, animals, insects, fish, reptiles and amphibians. Increasingly, they're discovering that it can take only one seemingly insignificant change to disrupt an entire ecosystem. And to spot those changes, researchers are turning more and more to citizen scientists for help.

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